This adult coloring book contains hand-drawn doodle style designs featuring lovely dogs. The thirty designs are of various difficulty levels and the images are printed on the fronts of pages only, so you don't need to worry about bleed-through if you choose to use markers. BONUS : The book includes also the download of a PDF file for COMPILATION 2, which is a printable book containing a various selection of coloring pages taken from the Happy Coloring Book series. Happy Coloring!